摘要
工程应用中的丁坝往往具有一定的端坡,而且经常处于淹没状态。为了研究端坡对淹没状态下丁坝附近水流结构的调整作用,采用水槽试验和三维浅水模型相结合的方法,分析淹没时丁坝阻水面积相等条件下坝头直立和具有一定端坡时丁坝附近的表层平面流场、底层平面流速分布和底层切应力分布情况。结果表明:淹没程度?H/H?0.17时,丁坝下游仍出现回流区,端坡系数m等于1时相对回流长度和坝头附近流向偏角最大;存在一定端坡时,坝头附近临近底床平面强流速范围和底床切应力范围显著减小或消失,m等于7时能够将丁坝附近流场调整得较为均匀。
Spur dike in engineering is usually with head slope and in submerged state.In order to study on impact of submerged spur dike head slope on water flow structure,flume test and 3-D shallow water numerical simulation are together used to study the free surface plane flow field,distributions of flow velocity and shear stress over flume bottom near submerged spur dikes with head slope,and the head slope coefficient is represented by m.The following conclusions are arrived at： 1） a re-circulation zone has been still formed with overtopping ratio 0.17,and the relative length of the re-circulation zone and the flow deflection angle reach maximum with 1;2） the zone with large relative velocity and the relative shear stress significantly decreases or disappears with head slope existing,and the water flow field becomes uniform when 7.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2012年第1期39-46,共8页
Chinese Journal of Hydrodynamics
基金
中央级公益性科研院所基本科研业务费专项资金(HKY-JBYW-2010-14)资助
关键词
淹没
丁坝
端坡
水流结构
submerged
spur dike
head slope
flow structure
